Auxiliary boom for excavators



April 29, 1930.

G. w. ACUFF, JR

AUXILIARY BOOM FOR EXCAVATORS Filed Feb. '7, 1929 s Sheets-Sheet 1 fn ven to r 6607 W14 A ril 29, 1930. W. AcuFF; JR 1,756,166

AUXILIARY BOOM FOR EXCAVATORS Filed Feb. 7, 1929 3 Sheets-Sheet 2 1 2 t1' WAJ 25 v ln wmto' r Attormgy AUXILIARY BOOM FOR EXCAVATORS Filed Feb.7, 1929 3 Sheets-Sheet 3 I32 I Q Invent-0 1" 6M %c fi Attarnqy PatentedApr. i 29, 1930 NITED ST TES PATENT oF icE GEORGE w. noun, JR. or sun.tours, mrssounx AUXILIARY 3001i]: FORLEXGAVATORS 1 Application filedFebruary 7, 1929. semi No. 338,225.

' The presentinvention relates to improvements in excavators and hasreference more particularly to an auxiliary boom for association withthe conventional shovel boom of the machine.

One of the important objects of the present invention is to provide anauxiliary boom attachment that will increase the output of the excavatorespecially where the excavator is used on high lift work and wheredigging at the bottom ismadevery 'difiicult especially if the earth ishard. y 6

One of the important objects of the present invention is to provide anauxiliary. boom that is pivotally associated with the main shovel boomwhereby said auxiliary boom may be utilized as an extension for the mainboom whenever necessary, means being pro- 'vided for normally holdingthe auxiliary 2 boom in a substantially horizontal position. Anotherimportant object of the" invention is to provide an auxiliary boomattachment that can be readily and easily installed withoutnecessitating material alterations of the shovel boom of thee'xcavator,-said auxiliaryboom being at all times positive and eflicientin its operation.

Still a further object is to provide an auxiliary boom associated withthe main shovel boom, the parts being disclosed in their normalpositions.

Figure 2 is ,a view similar to Figure 1, showing the position oftheauxiliary boom after the dipper'has been raised. I

Figure 3 is a similar side elevation showing ter which is simple inconstruction, inexpenw the dipper inits initial position for digginginto the earth; 6

Figure 4 is a top plan view of the auxiliary boom per se. v

Figure 5 is a side elevation thereof, and

. Figure 6 is a transverse section taken approximately on the line 6S ofFigure 5.

,In the drawings, wherein-for the purpose ofillustration is shown thepreferred embodiment of my invention, the numeral 1 designates generallyan excavating machine of.

cluding the wheeled body 2 on which is assembled the conventionalhoisting mecha nism arranged within the housing 3.

The shovel'boom 4 which is also of the conventional construction ispivoted at its lower end as at 5,,on the body 2, for vertical swingingmovement and this shovel boom carries the swinging and sliding dipperstick 6 that carries at its outer end the conventional dipper or bucket7. As the mechanism for effecting the sliding movement of the dipperunit forms no important part of the present invention, a detaileddescription thereof is believed unnecessary.

The outer or upper endsof the spaced arms of the main shovel boom 4 areformed with spaced registering openings 8, while. mounted between theextremities of these spaced arms is the sheave 9.

The auxiliary boom constituting my invention is denoted generally by.the numeral 10 and the same includes a pair of channelshaped bars 11 and12 respectivelythat are formed at their inner end portions with the anyconventional construction, the same inspaced registering, openings 13.-A sheave supportingshaft 14 between the outer ends of the bars 11 and 12and as is more clearly disclosed in Figure 4, 6 suitable sheaves 15 arearranged on this shaft 14. Y

The inner ends of the channel shaped bars of the auxiliary boom 10 aredisposed on opposite sides of the outer end portions of the main boom 4and a pivot forming rod 16 extends through predetermined registeringopenings 8 and 13 whereby the inner end of the.auxi liary boom ispivotally mounted on the upper end portion'of the main boom. Thehoisting cables are shown at 17 and the same extend over the sheaves9'and 15 and are operatively connected to the dipper or bucket 7,through the medium of the sheave 18.

The hoisting cables 17 are controlled by the 11 and 12, for cooperationwith the respective chains 20 that are attached at their ends to theouter end portions of the respective arms of the main boom '4 as at 21.This provides a means for limiting the downward swinging movement of theauxiliary boomlO, and normally maintains the auxiliary boom in ahorizontal position as shown very clearly in Figures l and 3 ofthe-drawings.

Depending brackets 22 are carried by the 7 bottom faces of theintermediate portions of and when the proper mechanism is actuated.

the bars or arms of the auxiliary boom, and a transverse. shaft 23extends through these alignedbrackets as suggested in Figure 6.

Suitable rollers 24 are arranged on the shaft 23, adjacent the innerfaces of the respective brackets as also clearly indicated in Figure 6.These rollers 24 are adapted to cooperate with the dipper stick 6 in themanner to be presently described.

When the axuiliary boom 10 ispositioned in the manner as shown in Figure3, the dipper 7 is in position for digging into the earth the dipperstick 6 will be operated to effect the swinging movement of the dipperstick to the position shown in Figure 1 and a further operation of theproper mechanism will cause the sliding and swinging movement of thedipper unit. The hoisting cables 17 when actuated will elevate thedipper 7 and when the dipper stick 6 engages with the rollers 24, theauxiliary boom will then be raised with the dipper 6. Vhen the dipper isat its maximum height, the auxiliary boom will be positioned'inalignment with the main'boom 4 as suggested in Figure2.

As the dipper is lowered, the auxiliary boom will also lower itselfuntil it is again ina horizontal plane and the chains 20 will limit thedownward swinging movement. of the auxiliary boom. 5

This arrangement provides a means whereby an excavating machine that isused in high lift 'work will perform its operation efliciently and to amaximum degree in such a manner as to overcome the difliculties indigging 'in bottomespecially where the dirt is 4 and to this end theauxiliary boom is brought to the position shown in Figure 2, whereby thebars 11 and ,12 are brought into alignment with the respective arms ofthe main boom and then an additional pin 25 ex-' tends through one pairof registering openings 13 in the bars and theupperm'ost pair 7 terialalterations and the device will at all times be positive and eflicientin carrying out the purpose for which it is designed. While I have shownthe preferred embodiment of my invention, it is to be understood thatvarious changes in the size, shape and arrangement of parts may beresorted to,

without departing from the spirit of the iny vention or the scope of theappended claims.

What I claim as new is 1. In an excavator, in combination with a mainboom, a dipper stick operatively associated with said main boom, adipper carried by the outer end of said dipper stick, a hoist cableattached to the dipper to lift the same, an auxiliary boom attached atits inner end on the upper end of the main boom for vertical swingingmovement, means for adjustably mounting said auxiliary boom on the upperend of said main boom, a' sheave carried by the outer end of theauxiliary boom over which the hoist cable is trained, said auxiliaryboom comprising a pair of bars arranged at their inner ends on oppositesides of the upper end portions of said main boom, the inner ends of thebars being formed with pairs of spaced registeringiopenings, a pivot pinextending through one pair of registering openings in the inner ends ofthe bars and through the outer end portion of the main boom forpivotally securing said bars to said main boom for vertical swingingmovement of the bars, chains secured to the upper end of said main boomand to said bars for limiting the downward swinging movement of saidbars, whereby said bars may be swung to a substantially horizontalposition,

asecond pin extending through another pair of registering openings inthe bars and through the main boom at a point outwardly of the firstmentioned pin for securing the bars of said auxiliary boom in alignmentwith the main boom to provide an extension therefor, brackets mounted onthe bars of said auxiliary boom to extend outwardly and downwardlytherefrom, a transverse shaft rotatably supported in said brackets,rollers mount-ed on said shaft; and the dipper stick of said main boomadapted to engage said rollers during the upward movement of said 7stick for swinging the bars of said auxiliary boom to a positionsubstantially in alignment with the main boom, and the free end of thebars of said auxiliary boom extending beyond the adjacent end of saidmain boom when said arms have been swung to the last named position. v

2. In an excavator, in combination with a main boom, a dipper stickoperatively associated with said main boom, a dipper carried by theouter end of said dipper stick, a hoist cable attached to' the dipper tolift the same, an auxiliary boom attached at its inner end on the upperend of the main boom for vertical swinging movement, a sheave carried bythe outer end of the auxiliary boom over which the hoist cable istrained, spaced transversely aligned brackets on said auxiliary 1o boomextending outwardly and downwardly therefrom, a transverse shaftrotatably supported in said bracket, rollers mounted on said shaft, andvthe dipper stick of said main boom adapted to engage said rollers duringthe upward movement of said stick for swinging said auxiliary boom to aposition substantially in alignment with the main boom, and thefree endof said auxiliary boom extending beyond the adjacent end of said mainboom when said auxiliary boom has been swung to the last named position.

In testimony whereof I aflix my signature.

I GEORGE W. ACUFF, JR.

